Spuds seem to be battle axes, if you look at them in petroglyphs. They are usually depicted in ornate handles. We know very little about them. We know that they don't exhibit use wear that would suggest their use as axes or adzes. They can be made of greenstone or chert and have not been found hafted in handles. This spud is 12 5/8 inches long and is made from basalt from Wayne Co. Mo. It was made by Larry, using modern tools. They are found on Mississippian sites like Cahokia Mounds and may be ceremonial axes.
This is a clearer view of the spud's bit.
Above is a Kaolin spud which is still in the manufacturing stage. it needs a lot more polishing before it is done.